Doing some performance test between ext3 and ext4 I noticed that ext4is not much faster or in some cases slower then ext3. Two years ago whenI tested ext4 it was a lot faster then ext3 (see my mail:http://lkml.org/lkml/2006/6/6/65). Doing some simple tests with bonnie++I got the following results:

2 years ago I used 2.6.16.8 but the hardware is still the same. So what hashappened with the performance of ext4? I noticed that 2 years ago I coulduse extents+mballoc+delalloc, now there is only extents+mballoc in thecurrent kernels. Could delalloc make the big difference? I saw thatin Andrew Morton mm tree delalloc is included. Unfortunately when I tried using2.6.26-rc2-mm1 a sync would never return and there where lot of otherodd things, so I could not do any tests with delalloc.

So any idea what I am doing wrong or what I could do to improve those numbers?Please CC me since I am not subscribed to the list.